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Rule Dark Skies

Zermatt - Dark Skies - Alps

Zermatt, Valais, Switzerland

Moonless nights with crystal-clear skies for deep-sky photography

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Pristine Dark Skies (pristine)
Zermatt
Sun, Feb 22 · 03:00–05:00 · 2h window
Low confidence
30%
🌛Moon Altitude-27.8--26°
☁️Total Cloud Coverage5%
starry-night weather icon
Good Dark Skies
Zermatt
Sun, Feb 22 · 05:00–05:40
🌛Moon Altitude:-26.8°
Medium

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Europe/Zurich
Astronomical Night
Any
Total Cloud Coverage
≤ 20.0%
Visibility
≥ 12000.0m
Precipitation Chance
≤ 10.0%
Moon Illumination
OR1·B1
≤ 35.0%
Moon Altitude
OR1·B2
≤ 10.0°
Mon, Feb 16
14:00100%126m100%1.2%21°
15:00100%138m100%1.2%15°
16:00100%95m100%1.2%7.2°
17:00100%171m100%1.2%-1.4°
18:00100%132m100%1.2%-11°
19:00100%122m100%1.2%-21°
20:00100%121m100%1.2%-31°
21:00100%135m100%1.2%-40°
22:00100%102m100%1.2%-49°
23:00100%119m100%1.2%-56°
Tue, Feb 17
24:00100%106m100%1.2%-59°
01:00100%134m100%0%-58°
02:00100%87m100%0%-53°
03:00100%156m100%0%-45°
04:00100%102m100%0%-36°
05:00100%136m100%0%-26°
06:00100%137m100%0%-16°
07:00100%131m100%0%-5.6°
08:00100%103m100%0%4.1°
09:00100%107m100%0%13°
10:00100%136m100%0%21°
11:00100%162m100%0%27°
12:00100%150m100%0%30°
13:00100%244m100%0%31°
14:0099%1215m82%0%29°
15:0096%2385m64%0%25°
16:0092%2618m46%0%18°
17:0062%5049m44%0%9.9°
18:0096%349m41%0%0.76°
19:0097%313m39%0%-8.9°
20:0097%656m26%0%-19°
21:0096%4972m13%0%-29°
22:0050%13415m0%0%-38°
23:0025%22422m8.7%0%-46°
Wed, Feb 18
24:004.8%24134m17%0%-51°
01:007.2%24135m26%1.2%-54°
02:0019%24134m36%1.2%-52°
03:0093%24135m46%1.2%-46°
04:0097%24135m56%1.2%-39°
05:0098%24134m55%1.2%-29°
06:0098%22762m54%1.2%-19°
07:00100%10941m52%1.2%-9°
08:0098%1904m48%1.2%1.2°
09:0028%24134m44%1.2%11°
10:0024%24135m39%1.2%20°
11:0042%24135m39%1.2%28°
12:0045%24134m39%1.2%34°
13:0069%15366m39%1.2%37°
14:0078%1256m26%1.2%37°
15:0089%1491m13%1.2%34°
16:00100%5637m0%1.2%29°
17:00100%3094m19%1.2%21°
18:00100%649m37%1.2%13°
19:00100%1037m56%1.2%3.1°
20:00100%971m62%1.2%-6.7°
21:00100%1403m69%1.2%-17°
22:00100%2823m75%1.2%-26°
23:00100%3073m84%1.2%-35°
Thu, Feb 19
24:00100%3817m92%1.2%-42°
01:00100%3138m100%4.5%-46°
02:00100%1586m95%4.5%-47°
03:00100%1370m90%4.5%-45°
04:00100%9162m85%4.5%-39°
05:00100%329m89%4.5%-31°
06:00100%92m93%4.5%-22°
07:00100%203m97%4.5%-12°
08:00100%124m93%4.5%-1.8°
09:00100%145m90%4.5%8.4°
10:00100%142m86%4.5%18°
11:00100%208m90%4.5%27°
12:00100%823m94%4.5%35°
13:00100%4963m98%4.5%41°
14:00100%4265m97%4.5%44°
15:00100%10038m97%4.5%43°
16:00100%5676m96%4.5%39°
17:00100%2968m97%4.5%33°
18:00100%1500m97%4.5%25°
19:00100%1003m98%4.5%15°
20:00100%704m96%4.5%5.6°
21:00100%405m94%4.5%-4.3°
22:00100%106m92%4.5%-14°
23:0099%268m94%4.5%-23°
Fri, Feb 20
24:0097%430m95%4.5%-31°
01:0096%592m96%10%-37°
02:0097%610m87%10%-40°
03:0099%628m78%10%-40°
04:00100%646m68%10%-37°
05:0099%3256m69%10%-31°
06:0098%5867m69%10%-24°
07:0097%8477m69%10%-15°
08:0098%6160m64%10%-4.8°
09:0099%3843m59%10%5.4°
10:00100%1526m54%10%16°
11:0099%1264m57%10%26°
12:0099%1003m60%10%35°
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.

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